Combined cascaded Rankine and direct expander based power units using LNG (liquefied natural gas) cold as heat sink in LNG regasification

García, Ramón Ferreiro; Carril, José Carbia; Gómez, Javier; Gómez, Manuel Romero

doi:10.1016/j.energy.2015.09.051

Cited by 70 publications

(34 citation statements)

References 22 publications

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“…the Stirling [7] and Kalina [8] cycles have also been put forward. Various configurations of RTC have been proposed: coupled to direct expansion [9], in cascade and combination with a Brayton cycle [1,4,[10][11][12][13][14]. Propane is the pure hydrocarbon most used as the working fluid in RTC for current application [1,2,9,[15][16][17], while in reference [1] ethane and ethene are put forth as the most suitable working fluids for low temperature RTC.…”

Section: Introductionmentioning

confidence: 99%

“…Recent and extensive review works [1,19] compares efficiencies of RTC that differ in: cycle configuration, working fluid, heat source, maximum temperatures and natural gas pressure. Unconventional cascade cycles for maximizing the specific power by increasing the cycle complexity are currently being reported [10]. Currently it is possible to find complex schemes that yield specific power as high as 160 kJ/kg [2].…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic analysis for working fluids comparison in Rankine-type cycles exploiting the cryogenic exergy in Liquefied Natural Gas (LNG) regasification

Ferreira

Catarino

Vaz

2017

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis for working fluids comparison in Rankine-type cycles exploiting the cryogenic exergy in Liquefied Natural Gas (LNG) regasification

Ferreira

Catarino

Vaz

2017

Applied Thermal Engineering

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“…Abundant cold energy is generated during the regasification process, while it is typically taken away by seawater in the current industries. Various energy conversion systems have been proposed to recover the LNG cold energy in recent years, such as Rankine cycle, Brayton cycle and combined cycle, etc [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Thermoacoustic Stirling power generation from LNG cold energy and low-temperature waste heat

Wang

Dubey

Choo

et al. 2017

Energy

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Recovering the cold energy generated in the regasification process of liquefied natural gas (LNG) can help to improve the energy efficiency of LNG power generation systems, meanwhile, abundant low-grade waste heat can also be exploited from the exhaust gas of gas turbines. This study proposes to apply the thermoacoustic Stirling electric generator to recover LNG cold energy and waste heat simultaneously. A pair of linear alternators is directly coupled with the thermoacoustic loop by replacing the long and bulky resonator completely. Numerical simulation is conducted on the basis of the thermoacoustic theory to characterize and optimize the operations of the system. The effects of the back volumes of linear alternators, feedback tube length and regenerator length on the output performances are investigated. The distributions of key parameters, including pressure, volume flow rate, phase difference, acoustic power and exergy flow, are further studied. One design of the thermoacoustic Stirling electric generator operated with 4 MPa helium gas is capable of generating 2.3 kW electric power with the highest exergy efficiency of 0.253 when the cold and hot ends are mantained at 110 K and 500 K. Performances can be further improved if the conversion efficiency of the linear alternators is further increased.

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“…The list of all assumed simulation parameters (taken from the available literature as an average of the values published in papers [21,39,40]) is provided in Table 2. The considered systems were assumed to have an ambient heat source.…”

Section: Process Modelling and Assumptionsmentioning

confidence: 99%

“…LNG can be also used as a heat sink in a power cycle using ambient or waste heat as the heat source. The most popular cold power cycles are: the direct expansion cycle [20], the Rankine cycle [21][22][23], the Brayton cycle [24], the absorption power cycle [25], the Stirling cycle [26][27][28] and combined cycles [29][30][31][32]. In most existing cryogenic plants, the recovery method for LNG exergy is based on direct expansion and ORC cycles [14].…”

Section: Introductionmentioning

confidence: 99%

Exergetic Analysis, Optimization and Comparison of LNG Cold Exergy Recovery Systems for Transportation

Dorosz

Wojcieszak

Malecha

2018

Entropy

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LNG (Liquefied Natural Gas) shares in the global energy market is steadily increasing. One possible application of LNG is as a fuel for transportation. Stricter air pollution regulations and emission controls have made the natural gas a promising alternative to liquid petroleum fuels, especially in the case of heavy transport. However, in most LNG-fueled vehicles, the physical exergy of LNG is destroyed in the regasification process. This paper investigates possible LNG exergy recovery systems for transportation. The analyses focus on "cold energy" recovery systems as the enthalpy of LNG, which may be used as cooling power in air conditioning or refrigeration. Moreover, four exergy recovery systems that use LNG as a low temperature heat sink to produce electric power are analyzed. This includes single-stage and two-stage direct expansion systems, an ORC (Organic Rankine Cycle) system, and a combined system (ORC + direct expansion). The optimization of the above-mentioned LNG power cycles and exergy analyses are also discussed, with the identification of exergy loss in all components. The analyzed systems achieved exergetic efficiencies in the range of 20% to 36%, which corresponds to a net work in the range of 214 to 380 kJ/kg LNG .

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Combined cascaded Rankine and direct expander based power units using LNG (liquefied natural gas) cold as heat sink in LNG regasification

Cited by 70 publications

References 22 publications

Thermodynamic analysis for working fluids comparison in Rankine-type cycles exploiting the cryogenic exergy in Liquefied Natural Gas (LNG) regasification

Thermodynamic analysis for working fluids comparison in Rankine-type cycles exploiting the cryogenic exergy in Liquefied Natural Gas (LNG) regasification

Thermoacoustic Stirling power generation from LNG cold energy and low-temperature waste heat

Exergetic Analysis, Optimization and Comparison of LNG Cold Exergy Recovery Systems for Transportation

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